Thor: The Dark World (2013)
When Dr. Jane Foster (Natalie Portman) gets cursed with a powerful entity known as the Aether, Thor is heralded of the cosmic event known as the Convergence and the genocidal Dark Elves.
Thousands of years ago, a race of beings known as Dark Elves tried to send the universe into darkness by using a weapon known as the Aether. Warriors from Asgard stopped them, but their leader Malekith (Christopher Eccleston) escaped to wait for another opportunity. The warriors find the Aether, and since it cannot be destroyed, they try to hide it. In the present day, Jane Foster (Natalie Portman) awaits the return of Thor (Chris Hemsworth), although it has been two years since they last saw once another. In the meantime, Thor has been trying to bring peace to the nine realms. Jane discovers an anomaly similar to the one that brought Thor to Earth. She goes to investigate, finds a wormhole, and is sucked into it. Back on Asgard, Thor wishes to return to Earth, but his father, Odin (Sir Anthony Hopkins), refuses to let him. Thor learns from Heimdall (Idris Elba), who can see into all of the realms, that Jane disappeared. Thor then returns to Earth just as Jane reappears. However, when some Policemen try to arrest her, an unknown energy repulses them. Thor then brings Jane to Asgard to find out what happened to her. When the energy is released again, they discover that when Jane disappeared, she crossed paths with the Aether and it entered her. Malekith, upon sensing that the time to strike is now, seeks out the Aether. He attacks Asgard and Thor's mother Frigga (Rene Russo) is killed protecting Jane. Odin wants to keep Jane on Asgard so that Malekith will come. Thor disagrees with his plan, so with his cohorts, he decides to take Jane away. He enlists the aid of his brother, Loki (Tom Hiddleston). Unfortunately, Loki's motivations remain unknown.
There are nine realms of Asgard, and once every five thousand years, they align. Earth happens to be one of these realms. These realms create portals between the worlds during the alignment which is called "Convergence". On Earth, in London, England, Jane Foster (Natalie Portman) believes she and her crew have discovered one such portal. Foster, while investigating the phenomenon, is transported to another realm and comes in contact with a substance called the Aether. Upon coming into contact with the substance, it draws Thor (Chris Hemsworth) from Asgard back to Earth. Thor takes Jane to Asgard to be cured from the Aether. Unfortunately, in doing so, it draws more than just Jane to that world. Another being called Malekith (Christopher Eccleston) wants to use the Aether to destroy Asgard. Devising a plan with his brother, the war criminal Loki (Tom Hiddleston), Thor heads to "The Dark World" to destroy the Aether and save Asgard. But can Loki be trusted?
A year after Loki's (Tom Hiddleston's) devastating alien attack on New York City, the Mighty Thor (Chris Hemsworth), along with his friends Lady Sif (Jaimie Alexander) and the Warriors Three fight to save the Nine Realms from deadly threats. When Thor's girlfriend Jane Foster (Natalie Portman) discovers a fluid like weapon called the Aether, she unknowingly awakens the evil Malekith (Christopher Eccleston) and his Dark Elf army. With this, Asgard may be facing its darkest hour. Thor forms an uneasy alliance with his nemesis Loki to save Jane, stop Malekith, and save the Nine Realms from total chaos and darkness.
Thor (Chris Hemsworth) returns to do battle with Malekith (Christopher Eccleston), the vengeful leader of a primordial race that seeks to destroy the Nine Realms, in this big-budget comic book adventure set after the events of Marvel's The Avengers (2012). With even Odin (Sir Anthony Hopkins) unable to protect Asgard from the approaching darkness, the god of thunder reunites with Jane Foster (Natalie Portman) and prepares to make the ultimate sacrifice in order to save the world from certain destruction.
- Eons ago, Bor, the father of Odin, clashes with the Dark Elf Malekith, who seeks to destroy the universe using a weapon known as the Aether. After conquering Malekith's forces, including enhanced warriors called the Kursed, on their home world of Svartalfheim, Bor safeguards the Aether within a stone column. Unbeknownst to him, Malekith, his lieutenant Algrim, and a handful of Dark Elves escape into suspended animation.
In present-day Asgard, Loki stands imprisoned for his war crimes on Earth. Meanwhile, Thor, alongside warriors Fandral, Volstagg and Sif repel marauders on Vanaheim, home of their comrade Hogun; it is the final battle in a war to pacify the Nine Realms following the reconstruction of Bifröst, the "Rainbow Bridge" between realms, which had been destroyed two years earlier. In London, astrophysicist Dr. Jane Foster's intern, Darcy Lewis, now with her own intern, Ian, takes Jane to an abandoned factory where objects have begun to disobey the laws of physics and disappear into thin air. Separating from the group, Jane is teleported to another world, where she is infected by the Aether.
The Asgardians learn that the Convergence, a rare alignment of the Nine Realms, is imminent; as the event approaches, portals linking the worlds appear at random. Heimdall alerts Thor of Jane's recent disappearance, leading Thor to search for her. When she inadvertently releases an unearthly force while being arrested by the police for trespassing on private property, he takes her to Asgard. However, the Asgardian healers say they do not know how to treat her. Odin, recognizing the Aether, warns Jane's infection will kill her given enough time, and that the Aether's return heralds a catastrophic prophecy.
Malekith, awakened by the Aether's release, turns Algrim into a Kursed and attacks Asgard. During the battle, Malekith and Algrim search for Jane, knowing she contains the Aether. When they fail to capture her, they escape, but not before killing Thor's mother Frigga in a swordfight. Despite Odin's orders not to leave Asgard, Thor reluctantly teams up with Loki, who knows of a secret portal to Malekith's world, where they will use Jane to lure and confront Malekith, away from Asgard. In return, Thor promises Loki that he can have his revenge on Malekith for killing their mother. With Volstagg and Sif stalling Asgardian soldiers and Fandral assisting their escape, Thor and Loki commandeer a Dark Elf spaceship and escape to Svartalfheim with Jane.
On Svartalfheim, Loki tricks Malekith into drawing the Aether out of Jane. However, Thor's attempt to destroy the substance fails, and the Aether-empowered Malekith leaves with his ship as Loki appears to be fatally wounded while protecting Thor from Algrim. Thor, cradling Loki in his arms, promises to tell their father of his sacrifice. Following Loki's apparent death, Thor and Jane discover another portal in a nearby cave and reunite with Jane's mentor Dr. Erik Selvig, Darcy and Ian in London. There, they learn that Malekith plans to unleash the Aether to destroy the universe, and that he will do this in Greenwich, the center of the Convergence. Thor battles Malekith, but a portal separates them, leaving Malekith unopposed. Thor comes back in time to help his mortal comrades use their scientific equipment to transport Malekith to Svartalfheim, where he is killed before he can destroy the universe.
Thor returns to Asgard, where he declines Odin's offer to take the throne and tells Odin of Loki's sacrifice. As he leaves, Odin's form transforms to that of a grinning Loki.
In a mid-credits scene, Volstagg and Sif visit the Collector and entrust the Aether to his care, commenting that, with the Tesseract already in Asgard, having two Infinity Stones so close together would be dangerous. As they leave, the Collector remarks, "One down, five to go." (Foreshadowing the Guardians of the Galaxy movie.) In a post-credits scene, Jane and Thor reunite on Earth, while somewhere in London a frost monster from Jotunheim, accidentally transported to Earth during the final battle, continues to run amok.